eAssist become standard equipment, 220hp turbo model available as a no-cost option

When it comes to extracting the most miles per gallon out of a vehicle, GM often turns to its eAssist solution for midsize sedans. While competing companies like Ford/Lincoln and Toyota/Lexus use full hybrid solutions to achieve lofty mpg ratings, GM's "mild hybrid" eAssist solution often lags well behind, especially in city mpg ratings.

Now GM has revealed that the addition of eAssist as standard equipment means that the base price for the 2013 Regal jumps from $27,055 to $29,015. The base 2.4-liter four-cylinder engine in the 2012 model, which was good for 19/31 (city/highway), gives way to a standard eAssist model that is rated at 25/36 (city/highway).

For those that simply don't want a Regal with eAssist, Buick offers a 220hp turbocharged 2.0-liter model as a no-cost option. And for those that crave even more power, the 270hp Regal GS is also available.

"With eAssist, Buick is redefining what a 'conventional powertrain' means to customers," said eAssist global chief engineer Stephen Poulos. "It changes the fuel economy – but not the experience – for the 97 percent of new car buyers who aren't buying hybrids."

"It takes advantage of the best parts of a hybrid, and eAssist is now standard equipment for Regal," Poulos added. "These new functions happen seamlessly, a requirement for Buick drivers who demand a refined driving experience. They'll really only notice a difference at the pump."

Manufacturers like Nissan have managed to employed advanced technology and continuously variable transmissions (CVTs) to help the 2013 Altima achieve 27/38 (city/highway) without the use of expensive batteries or electric motors. On the other side of the spectrum, the 2013 Lexus ES 300h is rated at 40/39 (city/highway).